[svn r25] * Fixed a lot of problems with string literals

* Fixed slice-slice copying assignment

test/globals1.d

@@ -0,0 +1,10 @@
+module globals1;
+
+char[] gstr = "hello world";
+
+void main()
+{
+    printf("%.*s\n", gstr.length, gstr.ptr);
+    char[] str = gstr;
+    printf("%.*s\n", str.length, str.ptr);
+}

test/strings1.d

@@ -0,0 +1,15 @@
+module strings1;
+
+void f(char[11] buffer)
+{
+    printf("%.*s\n", buffer.length, buffer.ptr);
+}
+
+void main()
+{
+    char[11] buffer;
+    char[] hello = "hello world";
+    {buffer[] = hello[];}
+    {f(buffer);}
+    {f("eleven char");}
+}

test/tuple1.d

@@ -0,0 +1,18 @@
+module tuple1;
+
+template Tuple(T...) {
+    alias T Tuple;
+}
+
+struct S
+{
+    int i;
+    long l;
+}
+
+void main()
+{
+    S s = S(Tuple!(1,2L));
+    assert(s.i == 1);
+    assert(s.l == 2);
+}